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Ummm......don't gas grilles and forklifts burn propane gas (vapor) while their tanks are filled filled with condensed vapor (liquid)? Don't the propane tanks on my travel trailer and gas grill have a float switch so that they can't be filled with more 80% liquid before it begins to vent to atmosphere?

The picture in my avatar is of the Houston Ship Channel and was taken from my backyard. I like to sit outside and slap mosquitos while watching countless supertankers, barges and cargo ships of every shape and size carry all sorts of deadly toxins to and fro. It's really beautiful at times.....just don't eat the three eyed fish....

Propane is a refrigerant - R290, so it follows the pressure/temperature rules that all refrigerants follow.

As long as there is some amount of liquid in the tank, the pressure depends on temperature and nothing else. At 55° - 85psi, at 70° - 110psi, at 85° - 140psi

You hit the nail on the head. But, propane is is not necessarily purposed as a refrigerant but can be used as one just as kerosene, gasoline, air (atmosphere) or many other compounds or gases can.

And to address the conversation in this thread, the tanks are filled with a liquid which presents a vapor pressure at the tank exit if the tank is positioned upright, just like a cylinder of R-22 or whatever. In the case of a gas grill a diaphragm somewhere in the supply hose connected to the tank reduces the tank pressure to a safe level. Also, on your cylinder look for a rupture disc or on a fork lift tank a pressure bleed valve connected to the outlet.

The picture in my avatar is of the Houston Ship Channel and was taken from my backyard. I like to sit outside and slap mosquitos while watching countless supertankers, barges and cargo ships of every shape and size carry all sorts of deadly toxins to and fro. It's really beautiful at times.....just don't eat the three eyed fish....

You hit the nail on the head. But, propane is is not necessarily purposed as a refrigerant but can be used as one just as kerosene, gasoline, air (atmosphere) or many other compounds or gases can.

And to address the conversation in this thread, the tanks are filled with a liquid which presents a vapor pressure at the tank exit if the tank is positioned upright, just like a cylinder of R-22 or whatever. In the case of a gas grill a diaphragm somewhere in the supply hose connected to the tank reduces the tank pressure to a safe level. Also, on your cylinder look for a rupture disc or on a fork lift tank a pressure bleed valve connected to the outlet.

I was thinking the guy laid the tank down on it's side, thats why he had a problem

Motor fuel tanks have a liquid dip tube that puts liquid LPG to the valve. Its either set up for laying on it's side or for stand up use. Either way, it ain't gonna work on a barbeque. Be careful that you didn't rupture the regulator diaphram putting liquid into it.

One way to outthink people is to make them think you think. They'll think you're not really thinking what you're trying to get them to think you think...........

You can fill a grill tank from a forklift tank, if you can find an adapter. If you are EPA certified and you are experienced in proper refrigerant recovery, you should have no problem. Remember to check your tank ratings and certification dates.

You can fill a grill tank from a forklift tank, if you can find an adapter. If you are EPA certified and you are experienced in proper refrigerant recovery, you should have no problem. Remember to check your tank ratings and certification dates.

So that's why my forkin lift tank is always empty!!!!!!!. I swapped it to vapor a few years ago and it does a whole lot better.
I got new tanks for it when I got it and It kept destroying the valve seat in the regulator. I think because of trapped liquid between the tank valve and the regulator after shutting down and turning off the tank valve.